<template>
	<view>
		<!-- 使用自定义的搜索组件 -->
		<!-- <my-search :bgcolor="'pink'" :radius="6"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧滑动区 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'rpx'}">
				<block v-for="(item, i) in cateList" :key="i">					
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh + 'rpx'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<!-- 三级分类盒子 -->
					<view class="cate-lv3-list">
						<!-- 三级分类的每一项 -->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
							<!-- 三级分类图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 三级分类文字 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用高度
				wh: 0,
				//分类列表数据
				cateList: [],
				//二级分类列表
				cateLevel2: [],
				//默认激活项
				active: 0,
				scrollTop: 0
			};
		},
		onLoad() {
			//获取屏幕高度
			const sysInfo = uni.getSystemInfoSync()		
			this.wh = sysInfo.windowHeight * 2 - 100
			
			//获取分类列表数据
			this._getCateList()
		},
		methods: {
			async _getCateList() {
				const {data: res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200){
					return uni.$showMsg()
				}
				
				this.cateList = res.message
				
				//为二级列表赋值
				this.cateLevel2 = res.message[0].children
			},
			
			activeChanged(i) {
				this.active = i
				this.cateLevel2 = this.cateList[this.active].children
				
				this.scrollTop = this.scrollTop == 0 ? 1: 0
			},
			
			//跳转到商品列表页面
			gotoGoodList(item3) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			
			gotoSearch() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;
	
		.left-scroll-view {
			width: 240rpx;
		}		
	}
	
	.left-scroll-view-item {
		background-color: #F7F7F7;
		line-height: 120rpx;
		text-align: center;
		font-size: 24rpx;
		
		&.active {
			background-color: #FFFFFF;
			position: relative;
			
			&::before {
				content: ' ';
				display: block;
				width: 6rpx;
				height: 60rpx;
				background-color: #C00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
	
	.cate-lv2-title {
		font-size: 24rpx;
		font-weight: bold;
		text-align: center;
		padding: 30rpx 0;
	}
	
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
			width: 33.33%;
			display: flex;
			flex-direction: column;
			justify-content: center;
			align-items: center;
			margin-bottom: 20rpx;
			image {
				width: 120rpx;
				height: 120rpx;
			}
			text {
				font-size: 24rpx;
			}
		}
	}
</style>
